@article{GDZPPN002187825,
title = {Properties of the van der Pol numbers and polynomials.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {258},
year = {1973},
pages = {35-46},
zbl = {0254.10013},
url = {http://dml.mathdoc.fr/item/GDZPPN002187825}
}
Howard, F.T. Properties of the van der Pol numbers and polynomials.. Journal für die reine und angewandte Mathematik, Tome 258 (1973) pp. 35-46. http://gdmltest.u-ga.fr/item/GDZPPN002187825/